I have few devices connected to wifi router, but pcap_dispatch() always returns 0 for wifi interface while live capturing on Mac OS X. The same code captures response in case of wired interface. Please clarify if I have missed any flag here.
pcap_dispatch() always returns 0 on Mac OSX for wifi interface
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If you are capturing in monitor mode, you will be getting native 802.11 packets, which do not look like Ethernet packets, so filtering similarly to Ethernet will not work.
Furthermore, if you're capturing in monitor mode on a protected network, i.e. a network using WEP or WPA/WPA2, everything past the 802.11 header will be encrypted, and you will not be able to filter on it.
So:
wlan dst 70:73:cb:c1:7c:61 and (arp or (vlan and arp))wlan dst 70:73:cb:c1:7c:61, and make sure the program that reads the packets either just blindly writes them out to a capture file or is capable of decrypting WEP or WPA/WPA2 packets (the only program I know of that can decrypt them is Wireshark, although some others might be able to do it as well).